// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *  Copyright (c) 2006-2010 Jiri Kosina
 *
 *  HID to Linux Input mapping
 */

/*
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/kernel.h>

#include <linux/hid.h>
#include <linux/hid-debug.h>

#include "hid-ids.h"

#define unk KEY_UNKNOWN
#define HID_FIELD_UNIT_CENTIMETERS 0x11
#define HID_FIELD_UNIT_INCHES 0x13
#define HID_FIELD_UNIT_INCHES_MUL 254
#define HID_FIELD_UNIT_DEGREES 0x14
#define HID_FIELD_UNIT_DEGREES_MUL 573
#define HID_FIELD_UNIT_RADIANS 0x12
#define HID_LOGICAL_EXT_MUL 10
#define HID_PHYSICAL_EXT_MUL 10
#define HID_BATTERY_CAP_MUL 100
#define HID_KMALLOC_DEFAULT_SIZE 4

static const unsigned char hid_keyboard[256] = {
    0,   0,   0,   0,   30,  48,  46,  32,  18,  33,  34,  35,  23,  36,  37,  38,  50,  49,  24,  25,  16,  19,
    31,  20,  22,  47,  17,  45,  21,  44,  2,   3,   4,   5,   6,   7,   8,   9,   10,  11,  28,  1,   14,  15,
    57,  12,  13,  26,  27,  43,  43,  39,  40,  41,  51,  52,  53,  58,  59,  60,  61,  62,  63,  64,  65,  66,
    67,  68,  87,  88,  99,  70,  119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69,  98,  55,  74,  78,
    96,  79,  80,  81,  75,  76,  77,  71,  72,  73,  82,  83,  86,  127, 116, 117, 183, 184, 185, 186, 187, 188,
    189, 190, 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135, 136, 113, 115, 114, unk, unk,
    unk, 121, unk, 89,  93,  124, 92,  94,  95,  unk, unk, unk, 122, 123, 90,  91,  85,  unk, unk, unk, unk, unk,
    unk, unk, 111, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk,
    unk, unk, unk, unk, unk, unk, 179, 180, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk,
    unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, unk, 111, unk, unk, unk,
    unk, unk, unk, unk, 29,  42,  56,  125, 97,  54,  100, 126, 164, 166, 165, 163, 161, 115, 114, 113, 150, 158,
    159, 128, 136, 177, 178, 176, 142, 152, 173, 140, unk, unk, unk, unk};

static const struct {
    __s32 x;
    __s32 y;
} hid_hat_to_axis[] = {{0, 0}, {0, -1}, {1, -1}, {1, 0}, {1, 1}, {0, 1}, {-1, 1}, {-1, 0}, {-1, -1}};

#define map_abs(c) hid_map_usage(hidinput, usage, &bit, &max, EV_ABS, (c))
#define map_rel(c) hid_map_usage(hidinput, usage, &bit, &max, EV_REL, (c))
#define map_key(c) hid_map_usage(hidinput, usage, &bit, &max, EV_KEY, (c))
#define map_led(c) hid_map_usage(hidinput, usage, &bit, &max, EV_LED, (c))

#define map_abs_clear(c) hid_map_usage_clear(hidinput, usage, &bit, &max, EV_ABS, (c))
#define map_key_clear(c) hid_map_usage_clear(hidinput, usage, &bit, &max, EV_KEY, (c))

static bool match_scancode(struct hid_usage *usage, unsigned int cur_idx, unsigned int scancode)
{
    return (usage->hid & (HID_USAGE_PAGE | HID_USAGE)) == scancode;
}

static bool match_keycode(struct hid_usage *usage, unsigned int cur_idx, unsigned int keycode)
{
    /*
     * We should exclude unmapped usages when doing lookup by keycode.
     */
    return (usage->type == EV_KEY && usage->code == keycode);
}

static bool match_index(struct hid_usage *usage, unsigned int cur_idx, unsigned int idx)
{
    return cur_idx == idx;
}

typedef bool (*hid_usage_cmp_t)(struct hid_usage *usage, unsigned int cur_idx, unsigned int val);

static struct hid_usage *hidinput_find_key(struct hid_device *hid, hid_usage_cmp_t match, unsigned int value,
                                           unsigned int *usage_idx)
{
    unsigned int i, j, k, cur_idx = 0;
    struct hid_report *report;
    struct hid_usage *usage;

    for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
        list_for_each_entry(report, &hid->report_enum[k].report_list, list)
        {
            for (i = 0; i < report->maxfield; i++) {
                for (j = 0; j < report->field[i]->maxusage; j++) {
                    usage = report->field[i]->usage + j;
                    if (usage->type == EV_KEY || usage->type == 0) {
                        if (match(usage, cur_idx, value)) {
                            if (usage_idx) {
                                *usage_idx = cur_idx;
                            }
                            return usage;
                        }
                        cur_idx++;
                    }
                }
            }
        }
    }
    return NULL;
}

static struct hid_usage *hidinput_locate_usage(struct hid_device *hid, const struct input_keymap_entry *ke,
                                               unsigned int *index)
{
    struct hid_usage *usage;
    unsigned int scancode;

    if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
        usage = hidinput_find_key(hid, match_index, ke->index, index);
    } else if (input_scancode_to_scalar(ke, &scancode) == 0) {
        usage = hidinput_find_key(hid, match_scancode, scancode, index);
    } else {
        usage = NULL;
    }

    return usage;
}

static int hidinput_getkeycode(struct input_dev *dev, struct input_keymap_entry *ke)
{
    struct hid_device *hid = input_get_drvdata(dev);
    struct hid_usage *usage;
    unsigned int scancode, index;

    usage = hidinput_locate_usage(hid, ke, &index);
    if (usage) {
        ke->keycode = usage->type == EV_KEY ? usage->code : KEY_RESERVED;
        ke->index = index;
        scancode = usage->hid & (HID_USAGE_PAGE | HID_USAGE);
        ke->len = sizeof(scancode);
        memcpy(ke->scancode, &scancode, sizeof(scancode));
        return 0;
    }

    return -EINVAL;
}

static int hidinput_setkeycode(struct input_dev *dev, const struct input_keymap_entry *ke, unsigned int *old_keycode)
{
    struct hid_device *hid = input_get_drvdata(dev);
    struct hid_usage *usage;

    usage = hidinput_locate_usage(hid, ke, NULL);
    if (usage) {
        *old_keycode = usage->type == EV_KEY ? usage->code : KEY_RESERVED;
        usage->code = ke->keycode;

        clear_bit(*old_keycode, dev->keybit);
        set_bit(usage->code, dev->keybit);
        dbg_hid("Assigned keycode %d to HID usage code %x\n", usage->code, usage->hid);

        /*
         * Set the keybit for the old keycode if the old keycode is used
         * by another key
         */
        if (hidinput_find_key(hid, match_keycode, *old_keycode, NULL)) {
            set_bit(*old_keycode, dev->keybit);
        }

        return 0;
    }

    return -EINVAL;
}

/**
 * hidinput_calc_abs_res - calculate an absolute axis resolution
 * @field: the HID report field to calculate resolution for
 * @code: axis code
 *
 * The formula is:
 *                         (logical_maximum - logical_minimum)
 * resolution = ----------------------------------------------------------
 *              (physical_maximum - physical_minimum) * 10 ^ unit_exponent
 *
 * as seen in the HID specification v1.11 6.2.2.7 Global Items.
 *
 * Only exponent 1 length units are processed. Centimeters and inches are
 * converted to millimeters. Degrees are converted to radians.
 */
__s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
{
    __s32 unit_exponent = field->unit_exponent;
    __s32 logical_extents = field->logical_maximum - field->logical_minimum;
    __s32 physical_extents = field->physical_maximum - field->physical_minimum;
    __s32 prev;

    /* Check if the extents are sane */
    if (logical_extents <= 0 || physical_extents <= 0) {
        return 0;
    }

    /*
     * Verify and convert units.
     * See HID specification v1.11 6.2.2.7 Global Items for unit decoding
     */
    switch (code) {
        case ABS_X:
        case ABS_Y:
        case ABS_Z:
        case ABS_MT_POSITION_X:
        case ABS_MT_POSITION_Y:
        case ABS_MT_TOOL_X:
        case ABS_MT_TOOL_Y:
        case ABS_MT_TOUCH_MAJOR:
        case ABS_MT_TOUCH_MINOR:
            if (field->unit == HID_FIELD_UNIT_CENTIMETERS) { /* If centimeters */
                /* Convert to millimeters */
                unit_exponent += 1;
            } else if (field->unit == HID_FIELD_UNIT_INCHES) { /* If inches */
                /* Convert to millimeters */
                prev = physical_extents;
                physical_extents *= HID_FIELD_UNIT_INCHES_MUL;
                if (physical_extents < prev) {
                    return 0;
                }
                unit_exponent -= 1;
            } else {
                return 0;
            }
            break;

        case ABS_RX:
        case ABS_RY:
        case ABS_RZ:
        case ABS_WHEEL:
        case ABS_TILT_X:
        case ABS_TILT_Y:
            if (field->unit == HID_FIELD_UNIT_DEGREES) { /* If degrees */
                /* Convert to radians */
                prev = logical_extents;
                logical_extents *= HID_FIELD_UNIT_DEGREES_MUL;
                if (logical_extents < prev) {
                    return 0;
                }
                unit_exponent += 1;
            } else if (field->unit != HID_FIELD_UNIT_RADIANS) { /* If not radians */
                return 0;
            }
            break;

        default:
            return 0;
    }

    /* Apply negative unit exponent */
    for (; unit_exponent < 0; unit_exponent++) {
        prev = logical_extents;
        logical_extents *= HID_LOGICAL_EXT_MUL;
        if (logical_extents < prev) {
            return 0;
        }
    }
    /* Apply positive unit exponent */
    for (; unit_exponent > 0; unit_exponent--) {
        prev = physical_extents;
        physical_extents *= HID_PHYSICAL_EXT_MUL;
        if (physical_extents < prev) {
            return 0;
        }
    }

    /* Calculate resolution */
    return DIV_ROUND_CLOSEST(logical_extents, physical_extents);
}
EXPORT_SYMBOL_GPL(hidinput_calc_abs_res);

#ifdef CONFIG_HID_BATTERY_STRENGTH
static enum power_supply_property hidinput_battery_props[] = {
    POWER_SUPPLY_PROP_PRESENT,    POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_CAPACITY,
    POWER_SUPPLY_PROP_MODEL_NAME, POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_SCOPE,
};

#define HID_BATTERY_QUIRK_PERCENT (1 << 0) /* always reports percent */
#define HID_BATTERY_QUIRK_FEATURE (1 << 1) /* ask for feature report */
#define HID_BATTERY_QUIRK_IGNORE (1 << 2)  /* completely ignore the battery */

static const struct hid_device_id hid_battery_quirks[] = {
    {HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ISO),
     HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE},
    {HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ANSI),
     HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE},
    {HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ANSI),
     HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE},
    {HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ISO),
     HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE},
    {HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_ANSI),
     HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE},
    {HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084), HID_BATTERY_QUIRK_IGNORE},
    {HID_USB_DEVICE(USB_VENDOR_ID_SYMBOL, USB_DEVICE_ID_SYMBOL_SCANNER_3), HID_BATTERY_QUIRK_IGNORE},
    {HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ASUSTEK, USB_DEVICE_ID_ASUSTEK_T100CHI_KEYBOARD), HID_BATTERY_QUIRK_IGNORE},
    {HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_DINOVO_EDGE_KBD), HID_BATTERY_QUIRK_IGNORE},
    {HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ASUS_UX550_TOUCHSCREEN), HID_BATTERY_QUIRK_IGNORE},
    {}};

static unsigned find_battery_quirk(struct hid_device *hdev)
{
    unsigned quirks = 0;
    const struct hid_device_id *match;

    match = hid_match_id(hdev, hid_battery_quirks);
    if (match != NULL) {
        quirks = match->driver_data;
    }

    return quirks;
}

static int hidinput_scale_battery_capacity(struct hid_device *dev, int value)
{
    if (dev->battery_min < dev->battery_max && value >= dev->battery_min && value <= dev->battery_max) {
        value = ((value - dev->battery_min) * HID_BATTERY_CAP_MUL) / (dev->battery_max - dev->battery_min);
    }

    return value;
}

static int hidinput_query_battery_capacity(struct hid_device *dev)
{
    u8 *buf;
    int ret;

    buf = kmalloc(HID_KMALLOC_DEFAULT_SIZE, GFP_KERNEL);
    if (!buf) {
        return -ENOMEM;
    }

    ret = hid_hw_raw_request(dev, dev->battery_report_id, buf, HID_KMALLOC_DEFAULT_SIZE, dev->battery_report_type,
                             HID_REQ_GET_REPORT);
    if (ret < ENOENT) {
        kfree(buf);
        return -ENODATA;
    }

    ret = hidinput_scale_battery_capacity(dev, buf[1]);
    kfree(buf);
    return ret;
}

static int hidinput_get_battery_property(struct power_supply *psy, enum power_supply_property prop,
                                         union power_supply_propval *val)
{
    struct hid_device *dev = power_supply_get_drvdata(psy);
    int value;
    int ret = 0;

    switch (prop) {
        case POWER_SUPPLY_PROP_PRESENT:
        case POWER_SUPPLY_PROP_ONLINE:
            val->intval = 1;
            break;

        case POWER_SUPPLY_PROP_CAPACITY:
            if (dev->battery_status != HID_BATTERY_REPORTED && !dev->battery_avoid_query) {
                value = hidinput_query_battery_capacity(dev);
                if (value < 0) {
                    return value;
                }
            } else {
                value = dev->battery_capacity;
            }

            val->intval = value;
            break;

        case POWER_SUPPLY_PROP_MODEL_NAME:
            val->strval = dev->name;
            break;

        case POWER_SUPPLY_PROP_STATUS:
            if (dev->battery_status != HID_BATTERY_REPORTED && !dev->battery_avoid_query) {
                value = hidinput_query_battery_capacity(dev);
                if (value < 0) {
                    return value;
                }

                dev->battery_capacity = value;
                dev->battery_status = HID_BATTERY_QUERIED;
            }

            if (dev->battery_status == HID_BATTERY_UNKNOWN) {
                val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
            } else {
                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
            }
            break;

        case POWER_SUPPLY_PROP_SCOPE:
            val->intval = POWER_SUPPLY_SCOPE_DEVICE;
            break;

        default:
            ret = -EINVAL;
            break;
    }

    return ret;
}

static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type, struct hid_field *field)
{
    struct power_supply_desc *psy_desc;
    struct power_supply_config psy_cfg = {
        .drv_data = dev,
    };
    unsigned quirks;
    s32 min, max;
    int error;

    if (dev->battery) {
        return 0; /* already initialized? */
    }

    quirks = find_battery_quirk(dev);

    hid_dbg(dev, "device %x:%x:%x %d quirks %d\n", dev->bus, dev->vendor, dev->product, dev->version, quirks);

    if (quirks & HID_BATTERY_QUIRK_IGNORE) {
        return 0;
    }

    psy_desc = kzalloc(sizeof(*psy_desc), GFP_KERNEL);
    if (!psy_desc) {
        return -ENOMEM;
    }

    psy_desc->name = kasprintf(GFP_KERNEL, "hid-%s-battery", strlen(dev->uniq) ? dev->uniq : dev_name(&dev->dev));
    if (!psy_desc->name) {
        error = -ENOMEM;
        goto err_free_mem;
    }

    psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
    psy_desc->properties = hidinput_battery_props;
    psy_desc->num_properties = ARRAY_SIZE(hidinput_battery_props);
    psy_desc->use_for_apm = 0;
    psy_desc->get_property = hidinput_get_battery_property;

    min = field->logical_minimum;
    max = field->logical_maximum;

    if (quirks & HID_BATTERY_QUIRK_PERCENT) {
        min = 0;
        max = 0x64;
    }

    if (quirks & HID_BATTERY_QUIRK_FEATURE) {
        report_type = HID_FEATURE_REPORT;
    }

    dev->battery_min = min;
    dev->battery_max = max;
    dev->battery_report_type = report_type;
    dev->battery_report_id = field->report->id;

    /*
     * Stylus is normally not connected to the device and thus we
     * can't query the device and get meaningful battery strength.
     * We have to wait for the device to report it on its own.
     */
    dev->battery_avoid_query = report_type == HID_INPUT_REPORT && field->physical == HID_DG_STYLUS;

    dev->battery = power_supply_register(&dev->dev, psy_desc, &psy_cfg);
    if (IS_ERR(dev->battery)) {
        error = PTR_ERR(dev->battery);
        hid_warn(dev, "can't register power supply: %d\n", error);
        goto err_free_name;
    }

    power_supply_powers(dev->battery, &dev->dev);
    return 0;

err_free_name:
    kfree(psy_desc->name);
err_free_mem:
    kfree(psy_desc);
    dev->battery = NULL;
    return error;
}

static void hidinput_cleanup_battery(struct hid_device *dev)
{
    const struct power_supply_desc *psy_desc;

    if (!dev->battery) {
        return;
    }

    psy_desc = dev->battery->desc;
    power_supply_unregister(dev->battery);
    kfree(psy_desc->name);
    kfree(psy_desc);
    dev->battery = NULL;
}

static void hidinput_update_battery(struct hid_device *dev, int value)
{
    int capacity;
    if (!dev->battery) {
        return;
    }
    if (value == 0 || value < dev->battery_min || value > dev->battery_max) {
        return;
    }
    capacity = hidinput_scale_battery_capacity(dev, value);
    if (dev->battery_status != HID_BATTERY_REPORTED || capacity != dev->battery_capacity) {
        dev->battery_capacity = capacity;
        dev->battery_status = HID_BATTERY_REPORTED;
        power_supply_changed(dev->battery);
    }
}
#else  /* !CONFIG_HID_BATTERY_STRENGTH */
static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type, struct hid_field *field)
{
    return 0;
}

static void hidinput_cleanup_battery(struct hid_device *dev)
{
}

static void hidinput_update_battery(struct hid_device *dev, int value)
{
}
#endif /* CONFIG_HID_BATTERY_STRENGTH */

static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_field *field, struct hid_usage *usage)
{
    struct input_dev *input = hidinput->input;
    struct hid_device *device = input_get_drvdata(input);
    int max = 0, code;
    unsigned long *bit = NULL;

    field->hidinput = hidinput;

    if (field->flags & HID_MAIN_ITEM_CONSTANT) {
        goto ignore;
    }

    /* Ignore if report count is out of bounds. */
    if (field->report_count < 1) {
        goto ignore;
    }

    /* only LED usages are supported in output fields */
    if (field->report_type == HID_OUTPUT_REPORT && (usage->hid & HID_USAGE_PAGE) != HID_UP_LED) {
        goto ignore;
    }

    if (device->driver->input_mapping) {
        int ret = device->driver->input_mapping(device, hidinput, field, usage, &bit, &max);
        if (ret > 0) {
            goto mapped;
        }
        if (ret < 0) {
            goto ignore;
        }
    }

    switch (usage->hid & HID_USAGE_PAGE) {
        case HID_UP_UNDEFINED:
            goto ignore;

        case HID_UP_KEYBOARD:
            set_bit(EV_REP, input->evbit);

            if ((usage->hid & HID_USAGE) < 0x100) {
                if (!hid_keyboard[usage->hid & HID_USAGE]) {
                    goto ignore;
                }
                map_key_clear(hid_keyboard[usage->hid & HID_USAGE]);
            } else {
                map_key(KEY_UNKNOWN);
            }

            break;

        case HID_UP_BUTTON:
            code = ((usage->hid - 1) & HID_USAGE);

            switch (field->application) {
                case HID_GD_MOUSE:
                case HID_GD_POINTER:
                    code += BTN_MOUSE;
                    break;
                case HID_GD_JOYSTICK:
                    if (code <= 0xf) {
                        code += BTN_JOYSTICK;
                    } else {
                        code += BTN_TRIGGER_HAPPY - 0x10;
                    }
                    break;
                case HID_GD_GAMEPAD:
                    if (code <= 0xf) {
                        code += BTN_GAMEPAD;
                    } else {
                        code += BTN_TRIGGER_HAPPY - 0x10;
                    }
                    break;
                default:
                    switch (field->physical) {
                        case HID_GD_MOUSE:
                        case HID_GD_POINTER:
                            code += BTN_MOUSE;
                            break;
                        case HID_GD_JOYSTICK:
                            code += BTN_JOYSTICK;
                            break;
                        case HID_GD_GAMEPAD:
                            code += BTN_GAMEPAD;
                            break;
                        default:
                            code += BTN_MISC;
                    }
            }

            map_key(code);
            break;

        case HID_UP_SIMULATION:
            switch (usage->hid & 0xffff) {
                case 0xba:
                    map_abs(ABS_RUDDER);
                    break;
                case 0xbb:
                    map_abs(ABS_THROTTLE);
                    break;
                case 0xc4:
                    map_abs(ABS_GAS);
                    break;
                case 0xc5:
                    map_abs(ABS_BRAKE);
                    break;
                case 0xc8:
                    map_abs(ABS_WHEEL);
                    break;
                default:
                    goto ignore;
            }
            break;

        case HID_UP_GENDESK:
            if ((usage->hid & 0xf0) == 0x80) { /* SystemControl */
                switch (usage->hid & 0xf) {
                    case 0x1:
                        map_key_clear(KEY_POWER);
                        break;
                    case 0x2:
                        map_key_clear(KEY_SLEEP);
                        break;
                    case 0x3:
                        map_key_clear(KEY_WAKEUP);
                        break;
                    case 0x4:
                        map_key_clear(KEY_CONTEXT_MENU);
                        break;
                    case 0x5:
                        map_key_clear(KEY_MENU);
                        break;
                    case 0x6:
                        map_key_clear(KEY_PROG1);
                        break;
                    case 0x7:
                        map_key_clear(KEY_HELP);
                        break;
                    case 0x8:
                        map_key_clear(KEY_EXIT);
                        break;
                    case 0x9:
                        map_key_clear(KEY_SELECT);
                        break;
                    case 0xa:
                        map_key_clear(KEY_RIGHT);
                        break;
                    case 0xb:
                        map_key_clear(KEY_LEFT);
                        break;
                    case 0xc:
                        map_key_clear(KEY_UP);
                        break;
                    case 0xd:
                        map_key_clear(KEY_DOWN);
                        break;
                    case 0xe:
                        map_key_clear(KEY_POWER2);
                        break;
                    case 0xf:
                        map_key_clear(KEY_RESTART);
                        break;
                    default:
                        goto unknown;
                }
                break;
            }

            if ((usage->hid & 0xf0) == 0xb0) { /* SC - Display */
                switch (usage->hid & 0xf) {
                    case 0x05:
                        map_key_clear(KEY_SWITCHVIDEOMODE);
                        break;
                    default:
                        goto ignore;
                }
                break;
            }

            /*
             * Some lazy vendors declare 255 usages for System Control,
             * leading to the creation of ABS_X|Y axis and too many others.
             * It wouldn't be a problem if joydev doesn't consider the
             * device as a joystick then.
             */
            if (field->application == HID_GD_SYSTEM_CONTROL) {
                goto ignore;
            }

            if ((usage->hid & 0xf0) == 0x90) { /* D-pad */
                switch (usage->hid) {
                    case HID_GD_UP:
                        usage->hat_dir = 1;
                        break;
                    case HID_GD_DOWN:
                        usage->hat_dir = 0x5;
                        break;
                    case HID_GD_RIGHT:
                        usage->hat_dir = 0x3;
                        break;
                    case HID_GD_LEFT:
                        usage->hat_dir = 0x7;
                        break;
                    default:
                        goto unknown;
                }
                if (field->dpad) {
                    map_abs(field->dpad);
                    goto ignore;
                }
                map_abs(ABS_HAT0X);
                break;
            }

            switch (usage->hid) {
                /* These usage IDs map directly to the usage codes. */
                case HID_GD_X:
                case HID_GD_Y:
                case HID_GD_Z:
                case HID_GD_RX:
                case HID_GD_RY:
                case HID_GD_RZ:
                    if (field->flags & HID_MAIN_ITEM_RELATIVE) {
                        map_rel(usage->hid & 0xf);
                    } else {
                        map_abs_clear(usage->hid & 0xf);
                    }
                    break;

                case HID_GD_WHEEL:
                    if (field->flags & HID_MAIN_ITEM_RELATIVE) {
                        set_bit(REL_WHEEL, input->relbit);
                        map_rel(REL_WHEEL_HI_RES);
                    } else {
                        map_abs(usage->hid & 0xf);
                    }
                    break;
                case HID_GD_SLIDER:
                case HID_GD_DIAL:
                    if (field->flags & HID_MAIN_ITEM_RELATIVE) {
                        map_rel(usage->hid & 0xf);
                    } else {
                        map_abs(usage->hid & 0xf);
                    }
                    break;

                case HID_GD_HATSWITCH:
                    usage->hat_min = field->logical_minimum;
                    usage->hat_max = field->logical_maximum;
                    map_abs(ABS_HAT0X);
                    break;

                case HID_GD_START:
                    map_key_clear(BTN_START);
                    break;
                case HID_GD_SELECT:
                    map_key_clear(BTN_SELECT);
                    break;

                case HID_GD_RFKILL_BTN:
                    /* MS wireless radio ctl extension, also check CA */
                    if (field->application == HID_GD_WIRELESS_RADIO_CTLS) {
                        map_key_clear(KEY_RFKILL);
                        /* We need to simulate the btn release */
                        field->flags |= HID_MAIN_ITEM_RELATIVE;
                        break;
                    }

                default:
                    goto unknown;
            }

            break;

        case HID_UP_LED:
            switch (usage->hid & 0xffff) { /* HID-Value:                   */
                case 0x01:
                    map_led(LED_NUML);
                    break; /*   "Num Lock"                 */
                case 0x02:
                    map_led(LED_CAPSL);
                    break; /*   "Caps Lock"                */
                case 0x03:
                    map_led(LED_SCROLLL);
                    break; /*   "Scroll Lock"              */
                case 0x04:
                    map_led(LED_COMPOSE);
                    break; /*   "Compose"                  */
                case 0x05:
                    map_led(LED_KANA);
                    break; /*   "Kana"                     */
                case 0x27:
                    map_led(LED_SLEEP);
                    break; /*   "Stand-By"                 */
                case 0x4c:
                    map_led(LED_SUSPEND);
                    break; /*   "System Suspend"           */
                case 0x09:
                    map_led(LED_MUTE);
                    break; /*   "Mute"                     */
                case 0x4b:
                    map_led(LED_MISC);
                    break; /*   "Generic Indicator"        */
                case 0x19:
                    map_led(LED_MAIL);
                    break; /*   "Message Waiting"          */
                case 0x4d:
                    map_led(LED_CHARGING);
                    break; /*   "External Power Connected" */

                default:
                    goto ignore;
            }
            break;

        case HID_UP_DIGITIZER:
            if ((field->application & 0xff) == 0x01) { /* Digitizer */
                __set_bit(INPUT_PROP_POINTER, input->propbit);
            } else if ((field->application & 0xff) == 0x02) { /* Pen */
                __set_bit(INPUT_PROP_DIRECT, input->propbit);
            }

            switch (usage->hid & 0xff) {
                case 0x00: /* Undefined */
                    goto ignore;

                case 0x30: /* TipPressure */
                    if (!test_bit(BTN_TOUCH, input->keybit)) {
                        device->quirks |= HID_QUIRK_NOTOUCH;
                        set_bit(EV_KEY, input->evbit);
                        set_bit(BTN_TOUCH, input->keybit);
                    }
                    map_abs_clear(ABS_PRESSURE);
                    break;

                case 0x32: /* InRange */
                    switch (field->physical & 0xff) {
                        case 0x21:
                            map_key(BTN_TOOL_MOUSE);
                            break;
                        case 0x22:
                            map_key(BTN_TOOL_FINGER);
                            break;
                        default:
                            map_key(BTN_TOOL_PEN);
                            break;
                    }
                    break;

                case 0x3b: /* Battery Strength */
                    hidinput_setup_battery(device, HID_INPUT_REPORT, field);
                    usage->type = EV_PWR;
                    return;

                case 0x3c: /* Invert */
                    map_key_clear(BTN_TOOL_RUBBER);
                    break;

                case 0x3d: /* X Tilt */
                    map_abs_clear(ABS_TILT_X);
                    break;

                case 0x3e: /* Y Tilt */
                    map_abs_clear(ABS_TILT_Y);
                    break;

                case 0x33: /* Touch */
                case 0x42: /* TipSwitch */
                case 0x43: /* TipSwitch2 */
                    device->quirks &= ~HID_QUIRK_NOTOUCH;
                    map_key_clear(BTN_TOUCH);
                    break;

                case 0x44: /* BarrelSwitch */
                    map_key_clear(BTN_STYLUS);
                    break;

                case 0x45: /* ERASER */
                    /*
                     * This event is reported when eraser tip touches the surface.
                     * Actual eraser (BTN_TOOL_RUBBER) is set by Invert usage when
                     * tool gets in proximity.
                     */
                    map_key_clear(BTN_TOUCH);
                    break;

                case 0x46: /* TabletPick */
                case 0x5a: /* SecondaryBarrelSwitch */
                    map_key_clear(BTN_STYLUS2);
                    break;

                case 0x5b: /* TransducerSerialNumber */
                    usage->type = EV_MSC;
                    usage->code = MSC_SERIAL;
                    bit = input->mscbit;
                    max = MSC_MAX;
                    break;

                default:
                    goto unknown;
            }
            break;

        case HID_UP_TELEPHONY:
            switch (usage->hid & HID_USAGE) {
                case 0x2f:
                    map_key_clear(KEY_MICMUTE);
                    break;
                case 0xb0:
                    map_key_clear(KEY_NUMERIC_0);
                    break;
                case 0xb1:
                    map_key_clear(KEY_NUMERIC_1);
                    break;
                case 0xb2:
                    map_key_clear(KEY_NUMERIC_2);
                    break;
                case 0xb3:
                    map_key_clear(KEY_NUMERIC_3);
                    break;
                case 0xb4:
                    map_key_clear(KEY_NUMERIC_4);
                    break;
                case 0xb5:
                    map_key_clear(KEY_NUMERIC_5);
                    break;
                case 0xb6:
                    map_key_clear(KEY_NUMERIC_6);
                    break;
                case 0xb7:
                    map_key_clear(KEY_NUMERIC_7);
                    break;
                case 0xb8:
                    map_key_clear(KEY_NUMERIC_8);
                    break;
                case 0xb9:
                    map_key_clear(KEY_NUMERIC_9);
                    break;
                case 0xba:
                    map_key_clear(KEY_NUMERIC_STAR);
                    break;
                case 0xbb:
                    map_key_clear(KEY_NUMERIC_POUND);
                    break;
                case 0xbc:
                    map_key_clear(KEY_NUMERIC_A);
                    break;
                case 0xbd:
                    map_key_clear(KEY_NUMERIC_B);
                    break;
                case 0xbe:
                    map_key_clear(KEY_NUMERIC_C);
                    break;
                case 0xbf:
                    map_key_clear(KEY_NUMERIC_D);
                    break;
                default:
                    goto ignore;
            }
            break;

        case HID_UP_CONSUMER: /* USB HUT v1.12, pages 75-84 */
            switch (usage->hid & HID_USAGE) {
                case 0x000:
                    goto ignore;
                case 0x030:
                    map_key_clear(KEY_POWER);
                    break;
                case 0x031:
                    map_key_clear(KEY_RESTART);
                    break;
                case 0x032:
                    map_key_clear(KEY_SLEEP);
                    break;
                case 0x034:
                    map_key_clear(KEY_SLEEP);
                    break;
                case 0x035:
                    map_key_clear(KEY_KBDILLUMTOGGLE);
                    break;
                case 0x036:
                    map_key_clear(BTN_MISC);
                    break;

                case 0x040:
                    map_key_clear(KEY_MENU);
                    break; /* Menu */
                case 0x041:
                    map_key_clear(KEY_SELECT);
                    break; /* Menu Pick */
                case 0x042:
                    map_key_clear(KEY_UP);
                    break; /* Menu Up */
                case 0x043:
                    map_key_clear(KEY_DOWN);
                    break; /* Menu Down */
                case 0x044:
                    map_key_clear(KEY_LEFT);
                    break; /* Menu Left */
                case 0x045:
                    map_key_clear(KEY_RIGHT);
                    break; /* Menu Right */
                case 0x046:
                    map_key_clear(KEY_ESC);
                    break; /* Menu Escape */
                case 0x047:
                    map_key_clear(KEY_KPPLUS);
                    break; /* Menu Value Increase */
                case 0x048:
                    map_key_clear(KEY_KPMINUS);
                    break; /* Menu Value Decrease */

                case 0x060:
                    map_key_clear(KEY_INFO);
                    break; /* Data On Screen */
                case 0x061:
                    map_key_clear(KEY_SUBTITLE);
                    break; /* Closed Caption */
                case 0x063:
                    map_key_clear(KEY_VCR);
                    break; /* VCR/TV */
                case 0x065:
                    map_key_clear(KEY_CAMERA);
                    break; /* Snapshot */
                case 0x069:
                    map_key_clear(KEY_RED);
                    break;
                case 0x06a:
                    map_key_clear(KEY_GREEN);
                    break;
                case 0x06b:
                    map_key_clear(KEY_BLUE);
                    break;
                case 0x06c:
                    map_key_clear(KEY_YELLOW);
                    break;
                case 0x06d:
                    map_key_clear(KEY_ASPECT_RATIO);
                    break;

                case 0x06f:
                    map_key_clear(KEY_BRIGHTNESSUP);
                    break;
                case 0x070:
                    map_key_clear(KEY_BRIGHTNESSDOWN);
                    break;
                case 0x072:
                    map_key_clear(KEY_BRIGHTNESS_TOGGLE);
                    break;
                case 0x073:
                    map_key_clear(KEY_BRIGHTNESS_MIN);
                    break;
                case 0x074:
                    map_key_clear(KEY_BRIGHTNESS_MAX);
                    break;
                case 0x075:
                    map_key_clear(KEY_BRIGHTNESS_AUTO);
                    break;

                case 0x079:
                    map_key_clear(KEY_KBDILLUMUP);
                    break;
                case 0x07a:
                    map_key_clear(KEY_KBDILLUMDOWN);
                    break;
                case 0x07c:
                    map_key_clear(KEY_KBDILLUMTOGGLE);
                    break;

                case 0x082:
                    map_key_clear(KEY_VIDEO_NEXT);
                    break;
                case 0x083:
                    map_key_clear(KEY_LAST);
                    break;
                case 0x084:
                    map_key_clear(KEY_ENTER);
                    break;
                case 0x088:
                    map_key_clear(KEY_PC);
                    break;
                case 0x089:
                    map_key_clear(KEY_TV);
                    break;
                case 0x08a:
                    map_key_clear(KEY_WWW);
                    break;
                case 0x08b:
                    map_key_clear(KEY_DVD);
                    break;
                case 0x08c:
                    map_key_clear(KEY_PHONE);
                    break;
                case 0x08d:
                    map_key_clear(KEY_PROGRAM);
                    break;
                case 0x08e:
                    map_key_clear(KEY_VIDEOPHONE);
                    break;
                case 0x08f:
                    map_key_clear(KEY_GAMES);
                    break;
                case 0x090:
                    map_key_clear(KEY_MEMO);
                    break;
                case 0x091:
                    map_key_clear(KEY_CD);
                    break;
                case 0x092:
                    map_key_clear(KEY_VCR);
                    break;
                case 0x093:
                    map_key_clear(KEY_TUNER);
                    break;
                case 0x094:
                    map_key_clear(KEY_EXIT);
                    break;
                case 0x095:
                    map_key_clear(KEY_HELP);
                    break;
                case 0x096:
                    map_key_clear(KEY_TAPE);
                    break;
                case 0x097:
                    map_key_clear(KEY_TV2);
                    break;
                case 0x098:
                    map_key_clear(KEY_SAT);
                    break;
                case 0x09a:
                    map_key_clear(KEY_PVR);
                    break;

                case 0x09c:
                    map_key_clear(KEY_CHANNELUP);
                    break;
                case 0x09d:
                    map_key_clear(KEY_CHANNELDOWN);
                    break;
                case 0x0a0:
                    map_key_clear(KEY_VCR2);
                    break;

                case 0x0b0:
                    map_key_clear(KEY_PLAY);
                    break;
                case 0x0b1:
                    map_key_clear(KEY_PAUSE);
                    break;
                case 0x0b2:
                    map_key_clear(KEY_RECORD);
                    break;
                case 0x0b3:
                    map_key_clear(KEY_FASTFORWARD);
                    break;
                case 0x0b4:
                    map_key_clear(KEY_REWIND);
                    break;
                case 0x0b5:
                    map_key_clear(KEY_NEXTSONG);
                    break;
                case 0x0b6:
                    map_key_clear(KEY_PREVIOUSSONG);
                    break;
                case 0x0b7:
                    map_key_clear(KEY_STOPCD);
                    break;
                case 0x0b8:
                    map_key_clear(KEY_EJECTCD);
                    break;
                case 0x0bc:
                    map_key_clear(KEY_MEDIA_REPEAT);
                    break;
                case 0x0b9:
                    map_key_clear(KEY_SHUFFLE);
                    break;
                case 0x0bf:
                    map_key_clear(KEY_SLOW);
                    break;

                case 0x0cd:
                    map_key_clear(KEY_PLAYPAUSE);
                    break;
                case 0x0cf:
                    map_key_clear(KEY_VOICECOMMAND);
                    break;
                case 0x0d8:
                    map_key_clear(KEY_DICTATE);
                    break;

                case 0x0d9:
                    map_key_clear(KEY_EMOJI_PICKER);
                    break;

                case 0x0e0:
                    map_abs_clear(ABS_VOLUME);
                    break;
                case 0x0e2:
                    map_key_clear(KEY_MUTE);
                    break;
                case 0x0e5:
                    map_key_clear(KEY_BASSBOOST);
                    break;
                case 0x0e9:
                    map_key_clear(KEY_VOLUMEUP);
                    break;
                case 0x0ea:
                    map_key_clear(KEY_VOLUMEDOWN);
                    break;
                case 0x0f5:
                    map_key_clear(KEY_SLOW);
                    break;

                case 0x181:
                    map_key_clear(KEY_BUTTONCONFIG);
                    break;
                case 0x182:
                    map_key_clear(KEY_BOOKMARKS);
                    break;
                case 0x183:
                    map_key_clear(KEY_CONFIG);
                    break;
                case 0x184:
                    map_key_clear(KEY_WORDPROCESSOR);
                    break;
                case 0x185:
                    map_key_clear(KEY_EDITOR);
                    break;
                case 0x186:
                    map_key_clear(KEY_SPREADSHEET);
                    break;
                case 0x187:
                    map_key_clear(KEY_GRAPHICSEDITOR);
                    break;
                case 0x188:
                    map_key_clear(KEY_PRESENTATION);
                    break;
                case 0x189:
                    map_key_clear(KEY_DATABASE);
                    break;
                case 0x18a:
                    map_key_clear(KEY_MAIL);
                    break;
                case 0x18b:
                    map_key_clear(KEY_NEWS);
                    break;
                case 0x18c:
                    map_key_clear(KEY_VOICEMAIL);
                    break;
                case 0x18d:
                    map_key_clear(KEY_ADDRESSBOOK);
                    break;
                case 0x18e:
                    map_key_clear(KEY_CALENDAR);
                    break;
                case 0x18f:
                    map_key_clear(KEY_TASKMANAGER);
                    break;
                case 0x190:
                    map_key_clear(KEY_JOURNAL);
                    break;
                case 0x191:
                    map_key_clear(KEY_FINANCE);
                    break;
                case 0x192:
                    map_key_clear(KEY_CALC);
                    break;
                case 0x193:
                    map_key_clear(KEY_PLAYER);
                    break;
                case 0x194:
                    map_key_clear(KEY_FILE);
                    break;
                case 0x196:
                    map_key_clear(KEY_WWW);
                    break;
                case 0x199:
                    map_key_clear(KEY_CHAT);
                    break;
                case 0x19c:
                    map_key_clear(KEY_LOGOFF);
                    break;
                case 0x19e:
                    map_key_clear(KEY_COFFEE);
                    break;
                case 0x19f:
                    map_key_clear(KEY_CONTROLPANEL);
                    break;
                case 0x1a2:
                    map_key_clear(KEY_APPSELECT);
                    break;
                case 0x1a3:
                    map_key_clear(KEY_NEXT);
                    break;
                case 0x1a4:
                    map_key_clear(KEY_PREVIOUS);
                    break;
                case 0x1a6:
                    map_key_clear(KEY_HELP);
                    break;
                case 0x1a7:
                    map_key_clear(KEY_DOCUMENTS);
                    break;
                case 0x1ab:
                    map_key_clear(KEY_SPELLCHECK);
                    break;
                case 0x1ae:
                    map_key_clear(KEY_KEYBOARD);
                    break;
                case 0x1b1:
                    map_key_clear(KEY_SCREENSAVER);
                    break;
                case 0x1b4:
                    map_key_clear(KEY_FILE);
                    break;
                case 0x1b6:
                    map_key_clear(KEY_IMAGES);
                    break;
                case 0x1b7:
                    map_key_clear(KEY_AUDIO);
                    break;
                case 0x1b8:
                    map_key_clear(KEY_VIDEO);
                    break;
                case 0x1bc:
                    map_key_clear(KEY_MESSENGER);
                    break;
                case 0x1bd:
                    map_key_clear(KEY_INFO);
                    break;
                case 0x1cb:
                    map_key_clear(KEY_ASSISTANT);
                    break;
                case 0x201:
                    map_key_clear(KEY_NEW);
                    break;
                case 0x202:
                    map_key_clear(KEY_OPEN);
                    break;
                case 0x203:
                    map_key_clear(KEY_CLOSE);
                    break;
                case 0x204:
                    map_key_clear(KEY_EXIT);
                    break;
                case 0x207:
                    map_key_clear(KEY_SAVE);
                    break;
                case 0x208:
                    map_key_clear(KEY_PRINT);
                    break;
                case 0x209:
                    map_key_clear(KEY_PROPS);
                    break;
                case 0x21a:
                    map_key_clear(KEY_UNDO);
                    break;
                case 0x21b:
                    map_key_clear(KEY_COPY);
                    break;
                case 0x21c:
                    map_key_clear(KEY_CUT);
                    break;
                case 0x21d:
                    map_key_clear(KEY_PASTE);
                    break;
                case 0x21f:
                    map_key_clear(KEY_FIND);
                    break;
                case 0x221:
                    map_key_clear(KEY_SEARCH);
                    break;
                case 0x222:
                    map_key_clear(KEY_GOTO);
                    break;
                case 0x223:
                    map_key_clear(KEY_HOMEPAGE);
                    break;
                case 0x224:
                    map_key_clear(KEY_BACK);
                    break;
                case 0x225:
                    map_key_clear(KEY_FORWARD);
                    break;
                case 0x226:
                    map_key_clear(KEY_STOP);
                    break;
                case 0x227:
                    map_key_clear(KEY_REFRESH);
                    break;
                case 0x22a:
                    map_key_clear(KEY_BOOKMARKS);
                    break;
                case 0x22d:
                    map_key_clear(KEY_ZOOMIN);
                    break;
                case 0x22e:
                    map_key_clear(KEY_ZOOMOUT);
                    break;
                case 0x22f:
                    map_key_clear(KEY_ZOOMRESET);
                    break;
                case 0x232:
                    map_key_clear(KEY_FULL_SCREEN);
                    break;
                case 0x233:
                    map_key_clear(KEY_SCROLLUP);
                    break;
                case 0x234:
                    map_key_clear(KEY_SCROLLDOWN);
                    break;
                case 0x238: /* AC Pan */
                    set_bit(REL_HWHEEL, input->relbit);
                    map_rel(REL_HWHEEL_HI_RES);
                    break;
                case 0x23d:
                    map_key_clear(KEY_EDIT);
                    break;
                case 0x25f:
                    map_key_clear(KEY_CANCEL);
                    break;
                case 0x269:
                    map_key_clear(KEY_INSERT);
                    break;
                case 0x26a:
                    map_key_clear(KEY_DELETE);
                    break;
                case 0x279:
                    map_key_clear(KEY_REDO);
                    break;

                case 0x289:
                    map_key_clear(KEY_REPLY);
                    break;
                case 0x28b:
                    map_key_clear(KEY_FORWARDMAIL);
                    break;
                case 0x28c:
                    map_key_clear(KEY_SEND);
                    break;
                case 0x29d:
                    map_key_clear(KEY_KBD_LAYOUT_NEXT);
                    break;
                case 0x2a2: map_key_clear(KEY_ALL_APPLICATIONS);
                    break;
                case 0x2c7:
                    map_key_clear(KEY_KBDINPUTASSIST_PREV);
                    break;
                case 0x2c8:
                    map_key_clear(KEY_KBDINPUTASSIST_NEXT);
                    break;
                case 0x2c9:
                    map_key_clear(KEY_KBDINPUTASSIST_PREVGROUP);
                    break;
                case 0x2ca:
                    map_key_clear(KEY_KBDINPUTASSIST_NEXTGROUP);
                    break;
                case 0x2cb:
                    map_key_clear(KEY_KBDINPUTASSIST_ACCEPT);
                    break;
                case 0x2cc:
                    map_key_clear(KEY_KBDINPUTASSIST_CANCEL);
                    break;
                case 0x29f:
                    map_key_clear(KEY_SCALE);
                    break;
                default:
                    map_key_clear(KEY_UNKNOWN);
            }
            break;

        case HID_UP_GENDEVCTRLS:
            switch (usage->hid) {
                case HID_DC_BATTERYSTRENGTH:
                    hidinput_setup_battery(device, HID_INPUT_REPORT, field);
                    usage->type = EV_PWR;
                    return;
                default:
                    break;
            }
            goto unknown;

        case HID_UP_HPVENDOR: /* Reported on a Dutch layout HP5308 */
            set_bit(EV_REP, input->evbit);
            switch (usage->hid & HID_USAGE) {
                case 0x021:
                    map_key_clear(KEY_PRINT);
                    break;
                case 0x070:
                    map_key_clear(KEY_HP);
                    break;
                case 0x071:
                    map_key_clear(KEY_CAMERA);
                    break;
                case 0x072:
                    map_key_clear(KEY_SOUND);
                    break;
                case 0x073:
                    map_key_clear(KEY_QUESTION);
                    break;
                case 0x080:
                    map_key_clear(KEY_EMAIL);
                    break;
                case 0x081:
                    map_key_clear(KEY_CHAT);
                    break;
                case 0x082:
                    map_key_clear(KEY_SEARCH);
                    break;
                case 0x083:
                    map_key_clear(KEY_CONNECT);
                    break;
                case 0x084:
                    map_key_clear(KEY_FINANCE);
                    break;
                case 0x085:
                    map_key_clear(KEY_SPORT);
                    break;
                case 0x086:
                    map_key_clear(KEY_SHOP);
                    break;
                default:
                    goto ignore;
            }
            break;

        case HID_UP_HPVENDOR2:
            set_bit(EV_REP, input->evbit);
            switch (usage->hid & HID_USAGE) {
                case 0x001:
                    map_key_clear(KEY_MICMUTE);
                    break;
                case 0x003:
                    map_key_clear(KEY_BRIGHTNESSDOWN);
                    break;
                case 0x004:
                    map_key_clear(KEY_BRIGHTNESSUP);
                    break;
                default:
                    goto ignore;
            }
            break;

        case HID_UP_MSVENDOR:
            goto ignore;

        case HID_UP_CUSTOM: /* Reported on Logitech and Apple USB keyboards */
            set_bit(EV_REP, input->evbit);
            goto ignore;

        case HID_UP_LOGIVENDOR:
            /* intentional fallback */
        case HID_UP_LOGIVENDOR2:
            /* intentional fallback */
        case HID_UP_LOGIVENDOR3:
            goto ignore;

        case HID_UP_PID:
            switch (usage->hid & HID_USAGE) {
                case 0xa4:
                    map_key_clear(BTN_DEAD);
                    break;
                default:
                    goto ignore;
            }
            break;

        default:
            unknown:
            if (field->report_size == 1) {
                if (field->report->type == HID_OUTPUT_REPORT) {
                    map_led(LED_MISC);
                    break;
                }
                map_key(BTN_MISC);
                break;
            }
            if (field->flags & HID_MAIN_ITEM_RELATIVE) {
                map_rel(REL_MISC);
                break;
            }
            map_abs(ABS_MISC);
            break;
    }

mapped:
    /* Mapping failed, bail out */
    if (!bit) {
        return;
    }

    if (device->driver->input_mapped && device->driver->input_mapped(device, hidinput, field, usage, &bit, &max) < 0) {
        /*
         * The driver indicated that no further generic handling
         * of the usage is desired.
         */
        return;
    }

    set_bit(usage->type, input->evbit);

    /*
     * This part is *really* controversial:
     * - HID aims at being generic so we should do our best to export
     *   all incoming events
     * - HID describes what events are, so there is no reason for ABS_X
     *   to be mapped to ABS_Y
     * - HID is using *_MISC+N as a default value, but nothing prevents
     *   *_MISC+N to overwrite a legitimate even, which confuses userspace
     *   (for instance ABS_MISC + 7 is ABS_MT_SLOT, which has a different
     *   processing)
     *
     * If devices still want to use this (at their own risk), they will
     * have to use the quirk HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE, but
     * the default should be a reliable mapping.
     */
    while (usage->code <= max && test_and_set_bit(usage->code, bit)) {
        if (device->quirks & HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE) {
            usage->code = find_next_zero_bit(bit, max + 1, usage->code);
        } else {
            device->status |= HID_STAT_DUP_DETECTED;
            goto ignore;
        }
    }

    if (usage->code > max) {
        goto ignore;
    }

    if (usage->type == EV_ABS) {
        int a = field->logical_minimum;
        int b = field->logical_maximum;

        if ((device->quirks & HID_QUIRK_BADPAD) && (usage->code == ABS_X || usage->code == ABS_Y)) {
            a = field->logical_minimum = 0;
            b = field->logical_maximum = 0xFF;
        }

        if (field->application == HID_GD_GAMEPAD || field->application == HID_GD_JOYSTICK) {
            input_set_abs_params(input, usage->code, a, b, (b - a) >> 0x8, (b - a) >> 0x4);
        } else {
            input_set_abs_params(input, usage->code, a, b, 0, 0);
        }

        input_abs_set_res(input, usage->code, hidinput_calc_abs_res(field, usage->code));

        /* use a larger default input buffer for MT devices */
        if (usage->code == ABS_MT_POSITION_X && input->hint_events_per_packet == 0) {
            input_set_events_per_packet(input, 0x3C);
        }
    }

    if (usage->type == EV_ABS && (usage->hat_min < usage->hat_max || usage->hat_dir)) {
        int i;
        for (i = usage->code; i < usage->code + 0x2 && i <= max; i++) {
            input_set_abs_params(input, i, -1, 1, 0, 0);
            set_bit(i, input->absbit);
        }
        if (usage->hat_dir && !field->dpad) {
            field->dpad = usage->code;
        }
    }

    /* for those devices which produce Consumer volume usage as relative,
     * we emulate pressing volumeup/volumedown appropriate number of times
     * in hidinput_hid_event()
     */
    if ((usage->type == EV_ABS) && (field->flags & HID_MAIN_ITEM_RELATIVE) && (usage->code == ABS_VOLUME)) {
        set_bit(KEY_VOLUMEUP, input->keybit);
        set_bit(KEY_VOLUMEDOWN, input->keybit);
    }

    if (usage->type == EV_KEY) {
        set_bit(EV_MSC, input->evbit);
        set_bit(MSC_SCAN, input->mscbit);
    }

    return;

ignore:
    usage->type = 0;
    usage->code = 0;
}

static void hidinput_handle_scroll(struct hid_usage *usage, struct input_dev *input, __s32 value)
{
    int code;
    int hi_res, lo_res;

    if (value == 0) {
        return;
    }

    if (usage->code == REL_WHEEL_HI_RES) {
        code = REL_WHEEL;
    } else {
        code = REL_HWHEEL;
    }

    /*
     * Windows reports one wheel click as value 120. Where a high-res
     * scroll wheel is present, a fraction of 120 is reported instead.
     * Our REL_WHEEL_HI_RES axis does the same because all HW must
     * adhere to the 120 expectation.
     */
    hi_res = value * 0x78 / usage->resolution_multiplier;

    usage->wheel_accumulated += hi_res;
    lo_res = usage->wheel_accumulated / 0x78;
    if (lo_res) {
        usage->wheel_accumulated -= lo_res * 0x78;
    }

    input_event(input, EV_REL, code, lo_res);
    input_event(input, EV_REL, usage->code, hi_res);
}

void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value)
{
    struct input_dev *input;
    unsigned *quirks = &hid->quirks;

    if (!usage->type) {
        return;
    }

    if (usage->type == EV_PWR) {
        hidinput_update_battery(hid, value);
        return;
    }

    if (!field->hidinput) {
        return;
    }

    input = field->hidinput->input;

    if (usage->type == EV_ABS &&
        (((*quirks & HID_QUIRK_X_INVERT) && usage->code == ABS_X) ||
         ((*quirks & HID_QUIRK_Y_INVERT) && usage->code == ABS_Y))) {
        value = field->logical_maximum - value;
    }

    if (usage->hat_min < usage->hat_max || usage->hat_dir) {
        int hat_dir = usage->hat_dir;
        if (!hat_dir) {
            hat_dir = (value - usage->hat_min) * 0x8 / (usage->hat_max - usage->hat_min + 1) + 1;
        }
        if (hat_dir < 0 || hat_dir > 0x8) {
            hat_dir = 0;
        }
        input_event(input, usage->type, usage->code, hid_hat_to_axis[hat_dir].x);
        input_event(input, usage->type, usage->code + 1, hid_hat_to_axis[hat_dir].y);
        return;
    }

    if (usage->hid == (HID_UP_DIGITIZER | 0x003c)) { /* Invert */
        *quirks = value ? (*quirks | HID_QUIRK_INVERT) : (*quirks & ~HID_QUIRK_INVERT);
        return;
    }

    if (usage->hid == (HID_UP_DIGITIZER | 0x0032)) { /* InRange */
        if (value) {
            input_event(input, usage->type, (*quirks & HID_QUIRK_INVERT) ? BTN_TOOL_RUBBER : usage->code, 1);
            return;
        }
        input_event(input, usage->type, usage->code, 0);
        input_event(input, usage->type, BTN_TOOL_RUBBER, 0);
        return;
    }

    if (usage->hid == (HID_UP_DIGITIZER | 0x0030) && (*quirks & HID_QUIRK_NOTOUCH)) { /* Pressure */
        int a = field->logical_minimum;
        int b = field->logical_maximum;
        input_event(input, EV_KEY, BTN_TOUCH, value > a + ((b - a) >> 0x3));
    }

    if (usage->hid == (HID_UP_PID | 0x83UL)) { /* Simultaneous Effects Max */
        dbg_hid("Maximum Effects - %d\n", value);
        return;
    }

    if (usage->hid == (HID_UP_PID | 0x7fUL)) {
        dbg_hid("PID Pool Report\n");
        return;
    }

    if ((usage->type == EV_KEY) && (usage->code == 0)) { /* Key 0 is "unassigned", not KEY_UNKNOWN */
        return;
    }

    if ((usage->type == EV_REL) && (usage->code == REL_WHEEL_HI_RES || usage->code == REL_HWHEEL_HI_RES)) {
        hidinput_handle_scroll(usage, input, value);
        return;
    }

    if ((usage->type == EV_ABS) && (field->flags & HID_MAIN_ITEM_RELATIVE) && (usage->code == ABS_VOLUME)) {
        int count = abs(value);
        int direction = value > 0 ? KEY_VOLUMEUP : KEY_VOLUMEDOWN;
        int i;

        for (i = 0; i < count; i++) {
            input_event(input, EV_KEY, direction, 1);
            input_sync(input);
            input_event(input, EV_KEY, direction, 0);
            input_sync(input);
        }
        return;
    }

    /*
     * Ignore out-of-range values as per HID specification,
     * section 5.10 and 6.2.25, when NULL state bit is present.
     * When it's not, clamp the value to match Microsoft's input
     * driver as mentioned in "Required HID usages for digitizers":
     * https://msdn.microsoft.com/en-us/library/windows/hardware/dn672278(v=vs.85).asp
     *
     * The logical_minimum < logical_maximum check is done so that we
     * don't unintentionally discard values sent by devices which
     * don't specify logical min and max.
     */
    if ((field->flags & HID_MAIN_ITEM_VARIABLE) && (field->logical_minimum < field->logical_maximum)) {
        if (field->flags & HID_MAIN_ITEM_NULL_STATE &&
            (value < field->logical_minimum || value > field->logical_maximum)) {
            dbg_hid("Ignoring out-of-range value %x\n", value);
            return;
        }
        value = clamp(value, field->logical_minimum, field->logical_maximum);
    }

    /*
     * Ignore reports for absolute data if the data didn't change. This is
     * not only an optimization but also fixes 'dead' key reports. Some
     * RollOver implementations for localized keys (like BACKSLASH/PIPE; HID
     * 0x31 and 0x32) report multiple keys, even though a localized keyboard
     * can only have one of them physically available. The 'dead' keys
     * report constant 0. As all map to the same keycode, they'd confuse
     * the input layer. If we filter the 'dead' keys on the HID level, we
     * skip the keycode translation and only forward real events.
     */
    if (!(field->flags & (HID_MAIN_ITEM_RELATIVE | HID_MAIN_ITEM_BUFFERED_BYTE)) &&
        (field->flags & HID_MAIN_ITEM_VARIABLE) && usage->usage_index < field->maxusage &&
        value == field->value[usage->usage_index]) {
        return;
    }

    /* report the usage code as scancode if the key status has changed */
    if (usage->type == EV_KEY && (!test_bit(usage->code, input->key)) == value) {
        input_event(input, EV_MSC, MSC_SCAN, usage->hid);
    }

    input_event(input, usage->type, usage->code, value);

    if ((field->flags & HID_MAIN_ITEM_RELATIVE) && usage->type == EV_KEY && value) {
        input_sync(input);
        input_event(input, usage->type, usage->code, 0);
    }
}

void hidinput_report_event(struct hid_device *hid, struct hid_report *report)
{
    struct hid_input *hidinput;

    if (hid->quirks & HID_QUIRK_NO_INPUT_SYNC) {
        return;
    }

    list_for_each_entry(hidinput, &hid->inputs, list) input_sync(hidinput->input);
}
EXPORT_SYMBOL_GPL(hidinput_report_event);

int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int code, struct hid_field **field)
{
    struct hid_report *report;
    int i, j;

    list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list)
    {
        for (i = 0; i < report->maxfield; i++) {
            *field = report->field[i];
            for (j = 0; j < (*field)->maxusage; j++) {
                if ((*field)->usage[j].type == type && (*field)->usage[j].code == code) {
                    return j;
                }
            }
        }
    }
    return -1;
}
EXPORT_SYMBOL_GPL(hidinput_find_field);

struct hid_field *hidinput_get_led_field(struct hid_device *hid)
{
    struct hid_report *report;
    struct hid_field *field;
    int i, j;

    list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list)
    {
        for (i = 0; i < report->maxfield; i++) {
            field = report->field[i];
            for (j = 0; j < field->maxusage; j++) {
                if (field->usage[j].type == EV_LED) {
                    return field;
                }
            }
        }
    }
    return NULL;
}
EXPORT_SYMBOL_GPL(hidinput_get_led_field);

unsigned int hidinput_count_leds(struct hid_device *hid)
{
    struct hid_report *report;
    struct hid_field *field;
    int i, j;
    unsigned int count = 0;

    list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list)
    {
        for (i = 0; i < report->maxfield; i++) {
            field = report->field[i];
            for (j = 0; j < field->maxusage; j++) {
                if (field->usage[j].type == EV_LED && field->value[j]) {
                    count += 1;
                }
            }
        }
    }
    return count;
}
EXPORT_SYMBOL_GPL(hidinput_count_leds);

static void hidinput_led_worker(struct work_struct *work)
{
    struct hid_device *hid = container_of(work, struct hid_device, led_work);
    struct hid_field *field;
    struct hid_report *report;
    int ret;
    u32 len;
    __u8 *buf;

    field = hidinput_get_led_field(hid);
    if (!field) {
        return;
    }

    /*
     * field->report is accessed unlocked regarding HID core. So there might
     * be another incoming SET-LED request from user-space, which changes
     * the LED state while we assemble our outgoing buffer. However, this
     * doesn't matter as hid_output_report() correctly converts it into a
     * boolean value no matter what information is currently set on the LED
     * field (even garbage). So the remote device will always get a valid
     * request.
     * And in case we send a wrong value, a next led worker is spawned
     * for every SET-LED request so the following worker will send the
     * correct value, guaranteed!
     */

    report = field->report;

    /* use custom SET_REPORT request if possible (asynchronous) */
    if (hid->ll_driver->request) {
        return hid->ll_driver->request(hid, report, HID_REQ_SET_REPORT);
    }

    /* fall back to generic raw-output-report */
    len = hid_report_len(report);
    buf = hid_alloc_report_buf(report, GFP_KERNEL);
    if (!buf) {
        return;
    }

    hid_output_report(report, buf);
    /* synchronous output report */
    ret = hid_hw_output_report(hid, buf, len);
    if (ret == -ENOSYS) {
        hid_hw_raw_request(hid, report->id, buf, len, HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
    }
    kfree(buf);
}

static int hidinput_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
    struct hid_device *hid = input_get_drvdata(dev);
    struct hid_field *field;
    int offset;

    if (type == EV_FF) {
        return input_ff_event(dev, type, code, value);
    }

    if (type != EV_LED) {
        return -1;
    }

    if ((offset = hidinput_find_field(hid, type, code, &field)) == -1) {
        hid_warn(dev, "event field not found\n");
        return -1;
    }

    hid_set_field(field, offset, value);

    schedule_work(&hid->led_work);
    return 0;
}

static int hidinput_open(struct input_dev *dev)
{
    struct hid_device *hid = input_get_drvdata(dev);

    return hid_hw_open(hid);
}

static void hidinput_close(struct input_dev *dev)
{
    struct hid_device *hid = input_get_drvdata(dev);

    hid_hw_close(hid);
}

static bool __hidinput_change_resolution_multipliers(struct hid_device *hid, struct hid_report *report,
                                                     bool use_logical_max)
{
    struct hid_usage *usage;
    bool update_needed = false;
    bool get_report_completed = false;
    int i, j;

    if (report->maxfield == 0) {
        return false;
    }

    for (i = 0; i < report->maxfield; i++) {
        __s32 value = use_logical_max ? report->field[i]->logical_maximum : report->field[i]->logical_minimum;

        /* There is no good reason for a Resolution
         * Multiplier to have a count other than 1.
         * Ignore that case.
         */
        if (report->field[i]->report_count != 1) {
            continue;
        }

        for (j = 0; j < report->field[i]->maxusage; j++) {
            usage = &report->field[i]->usage[j];

            if (usage->hid != HID_GD_RESOLUTION_MULTIPLIER) {
                continue;
            }

            /*
             * If we have more than one feature within this
             * report we need to fill in the bits from the
             * others before we can overwrite the ones for the
             * Resolution Multiplier.
             *
             * But if we're not allowed to read from the device,
             * we just bail. Such a device should not exist
             * anyway.
             */
            if (!get_report_completed && report->maxfield > 1) {
                if (hid->quirks & HID_QUIRK_NO_INIT_REPORTS) {
                    return update_needed;
                }

                hid_hw_request(hid, report, HID_REQ_GET_REPORT);
                hid_hw_wait(hid);
                get_report_completed = true;
            }

            report->field[i]->value[j] = value;
            update_needed = true;
        }
    }

    return update_needed;
}

static void hidinput_change_resolution_multipliers(struct hid_device *hid)
{
    struct hid_report_enum *rep_enum;
    struct hid_report *rep;
    int ret;

    rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
    list_for_each_entry(rep, &rep_enum->report_list, list)
    {
        bool update_needed = __hidinput_change_resolution_multipliers(hid, rep, true);
        if (update_needed) {
            ret = __hid_request(hid, rep, HID_REQ_SET_REPORT);
            if (ret) {
                __hidinput_change_resolution_multipliers(hid, rep, false);
                return;
            }
        }
    }
    /* refresh our structs */
    hid_setup_resolution_multiplier(hid);
}

static void report_features(struct hid_device *hid)
{
    struct hid_driver *drv = hid->driver;
    struct hid_report_enum *rep_enum;
    struct hid_report *rep;
    struct hid_usage *usage;
    int i, j;

    rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
    list_for_each_entry(rep, &rep_enum->report_list, list) {
        for (i = 0; i < rep->maxfield; i++) {
            /* Ignore if report count is out of bounds. */
            if (rep->field[i]->report_count < 1) {
                continue;
            }

            for (j = 0; j < rep->field[i]->maxusage; j++) {
                usage = &rep->field[i]->usage[j];

                /* Verify if Battery Strength feature is available */
                if (usage->hid == HID_DC_BATTERYSTRENGTH) {
                    hidinput_setup_battery(hid, HID_FEATURE_REPORT, rep->field[i]);
                }

                if (drv->feature_mapping) {
                    drv->feature_mapping(hid, rep->field[i], usage);
                }
            }
        }
    }
}

static struct hid_input *hidinput_allocate(struct hid_device *hid, unsigned int application)
{
    struct hid_input *hidinput = kzalloc(sizeof(*hidinput), GFP_KERNEL);
    struct input_dev *input_dev = input_allocate_device();
    const char *suffix = NULL;
    size_t suffix_len, name_len;

    if (!hidinput || !input_dev) {
        goto fail;
    }

    if ((hid->quirks & HID_QUIRK_INPUT_PER_APP) && hid->maxapplication > 1) {
        switch (application) {
            case HID_GD_KEYBOARD:
                suffix = "Keyboard";
                break;
            case HID_GD_KEYPAD:
                suffix = "Keypad";
                break;
            case HID_GD_MOUSE:
                suffix = "Mouse";
                break;
            case HID_DG_STYLUS:
                suffix = "Pen";
                break;
            case HID_DG_TOUCHSCREEN:
                suffix = "Touchscreen";
                break;
            case HID_DG_TOUCHPAD:
                suffix = "Touchpad";
                break;
            case HID_GD_SYSTEM_CONTROL:
                suffix = "System Control";
                break;
            case HID_CP_CONSUMER_CONTROL:
                suffix = "Consumer Control";
                break;
            case HID_GD_WIRELESS_RADIO_CTLS:
                suffix = "Wireless Radio Control";
                break;
            case HID_GD_SYSTEM_MULTIAXIS:
                suffix = "System Multi Axis";
                break;
            default:
                break;
        }
    }

    if (suffix) {
        name_len = strlen(hid->name);
        suffix_len = strlen(suffix);
        if ((name_len < suffix_len) || strcmp(hid->name + name_len - suffix_len, suffix)) {
            hidinput->name = kasprintf(GFP_KERNEL, "%s %s", hid->name, suffix);
            if (!hidinput->name) {
                goto fail;
            }
        }
    }

    input_set_drvdata(input_dev, hid);
    input_dev->event = hidinput_input_event;
    input_dev->open = hidinput_open;
    input_dev->close = hidinput_close;
    input_dev->setkeycode = hidinput_setkeycode;
    input_dev->getkeycode = hidinput_getkeycode;

    input_dev->name = hidinput->name ? hidinput->name : hid->name;
    input_dev->phys = hid->phys;
    input_dev->uniq = hid->uniq;
    input_dev->id.bustype = hid->bus;
    input_dev->id.vendor = hid->vendor;
    input_dev->id.product = hid->product;
    input_dev->id.version = hid->version;
    input_dev->dev.parent = &hid->dev;

    hidinput->input = input_dev;
    hidinput->application = application;
    list_add_tail(&hidinput->list, &hid->inputs);

    INIT_LIST_HEAD(&hidinput->reports);

    return hidinput;

fail:
    kfree(hidinput);
    input_free_device(input_dev);
    hid_err(hid, "Out of memory during hid input probe\n");
    return NULL;
}

static bool hidinput_has_been_populated(struct hid_input *hidinput)
{
    int i;
    unsigned long r = 0;

    for (i = 0; i < BITS_TO_LONGS(EV_CNT); i++) {
        r |= hidinput->input->evbit[i];
    }

    for (i = 0; i < BITS_TO_LONGS(KEY_CNT); i++) {
        r |= hidinput->input->keybit[i];
    }

    for (i = 0; i < BITS_TO_LONGS(REL_CNT); i++) {
        r |= hidinput->input->relbit[i];
    }

    for (i = 0; i < BITS_TO_LONGS(ABS_CNT); i++) {
        r |= hidinput->input->absbit[i];
    }

    for (i = 0; i < BITS_TO_LONGS(MSC_CNT); i++) {
        r |= hidinput->input->mscbit[i];
    }

    for (i = 0; i < BITS_TO_LONGS(LED_CNT); i++) {
        r |= hidinput->input->ledbit[i];
    }

    for (i = 0; i < BITS_TO_LONGS(SND_CNT); i++) {
        r |= hidinput->input->sndbit[i];
    }

    for (i = 0; i < BITS_TO_LONGS(FF_CNT); i++) {
        r |= hidinput->input->ffbit[i];
    }

    for (i = 0; i < BITS_TO_LONGS(SW_CNT); i++) {
        r |= hidinput->input->swbit[i];
    }

    return !!r;
}

static void hidinput_cleanup_hidinput(struct hid_device *hid, struct hid_input *hidinput)
{
    struct hid_report *report;
    int i, k;

    list_del(&hidinput->list);
    input_free_device(hidinput->input);
    kfree(hidinput->name);

    for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
        if ((k == HID_OUTPUT_REPORT) && (hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORTS)) {
            continue;
        }

        list_for_each_entry(report, &hid->report_enum[k].report_list, list)
        {
            for (i = 0; i < report->maxfield; i++) {
                if (report->field[i]->hidinput == hidinput) {
                    report->field[i]->hidinput = NULL;
                }
            }
        }
    }

    kfree(hidinput);
}

static struct hid_input *hidinput_match(struct hid_report *report)
{
    struct hid_device *hid = report->device;
    struct hid_input *hidinput;

    list_for_each_entry(hidinput, &hid->inputs, list)
    {
        if (hidinput->report && hidinput->report->id == report->id) {
            return hidinput;
        }
    }

    return NULL;
}

static struct hid_input *hidinput_match_application(struct hid_report *report)
{
    struct hid_device *hid = report->device;
    struct hid_input *hidinput;

    list_for_each_entry(hidinput, &hid->inputs, list)
    {
        if (hidinput->application == report->application) {
            return hidinput;
        }
    }

    return NULL;
}

static inline void hidinput_configure_usages(struct hid_input *hidinput, struct hid_report *report)
{
    int i, j;

    for (i = 0; i < report->maxfield; i++) {
        for (j = 0; j < report->field[i]->maxusage; j++) {
            hidinput_configure_usage(hidinput, report->field[i], report->field[i]->usage + j);
        }
    }
}

/*
 * Register the input device; print a message.
 * Configure the input layer interface
 * Read all reports and initialize the absolute field values.
 */

int hidinput_connect(struct hid_device *hid, unsigned int force)
{
    struct hid_driver *drv = hid->driver;
    struct hid_report *report;
    struct hid_input *next, *hidinput = NULL;
    unsigned int application;
    int i, k;

    INIT_LIST_HEAD(&hid->inputs);
    INIT_WORK(&hid->led_work, hidinput_led_worker);

    hid->status &= ~HID_STAT_DUP_DETECTED;

    if (!force) {
        for (i = 0; i < hid->maxcollection; i++) {
            struct hid_collection *col = &hid->collection[i];
            if (col->type == HID_COLLECTION_APPLICATION || col->type == HID_COLLECTION_PHYSICAL) {
                if (IS_INPUT_APPLICATION(col->usage)) {
                    break;
                }
            }
        }

        if (i == hid->maxcollection) {
            return -1;
        }
    }

    report_features(hid);

    for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
        if ((k == HID_OUTPUT_REPORT) && (hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORTS)) {
            continue;
        }

        list_for_each_entry(report, &hid->report_enum[k].report_list, list)
        {
            if (!report->maxfield) {
                continue;
            }

            application = report->application;

            /*
             * Find the previous hidinput report attached
             * to this report id.
             */
            if (hid->quirks & HID_QUIRK_MULTI_INPUT) {
                hidinput = hidinput_match(report);
            } else if (hid->maxapplication > 1 && (hid->quirks & HID_QUIRK_INPUT_PER_APP)) {
                hidinput = hidinput_match_application(report);
            }

            if (!hidinput) {
                hidinput = hidinput_allocate(hid, application);
                if (!hidinput) {
                    goto out_unwind;
                }
            }

            hidinput_configure_usages(hidinput, report);

            if (hid->quirks & HID_QUIRK_MULTI_INPUT) {
                hidinput->report = report;
            }

            list_add_tail(&report->hidinput_list, &hidinput->reports);
        }
    }

    hidinput_change_resolution_multipliers(hid);

    list_for_each_entry_safe(hidinput, next, &hid->inputs, list)
    {
        if (drv->input_configured && drv->input_configured(hid, hidinput)) {
            goto out_unwind;
        }

        if (!hidinput_has_been_populated(hidinput)) {
            /* no need to register an input device not populated */
            hidinput_cleanup_hidinput(hid, hidinput);
            continue;
        }

        if (input_register_device(hidinput->input)) {
            goto out_unwind;
        }
        hidinput->registered = true;
    }

    if (list_empty(&hid->inputs)) {
        hid_err(hid, "No inputs registered, leaving\n");
        goto out_unwind;
    }

    if (hid->status & HID_STAT_DUP_DETECTED) {
        hid_dbg(hid, "Some usages could not be mapped, please use HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE if this is "
                     "legitimate.\n");
    }

    return 0;

out_unwind:
    /* unwind the ones we already registered */
    hidinput_disconnect(hid);

    return -1;
}
EXPORT_SYMBOL_GPL(hidinput_connect);

void hidinput_disconnect(struct hid_device *hid)
{
    struct hid_input *hidinput, *next;

    hidinput_cleanup_battery(hid);

    list_for_each_entry_safe(hidinput, next, &hid->inputs, list)
    {
        list_del(&hidinput->list);
        if (hidinput->registered) {
            input_unregister_device(hidinput->input);
        } else {
            input_free_device(hidinput->input);
        }
        kfree(hidinput->name);
        kfree(hidinput);
    }

    /* led_work is spawned by input_dev callbacks, but doesn't access the
     * parent input_dev at all. Once all input devices are removed, we
     * know that led_work will never get restarted, so we can cancel it
     * synchronously and are safe. */
    cancel_work_sync(&hid->led_work);
}
EXPORT_SYMBOL_GPL(hidinput_disconnect);
